Nucleon Resonances in Kaon Photoproduction

Details Nucleon Resonances in Kaon Photoproduction Nucleon Resonances in Kaon Photoproduction

1999-01-22

arxiv.org/abs/nucl-th/9901066v1

Physics

Nuclear Physics

Nuclear Theory

17 pages, LaTex, 10 figures, to be published in the Proceeding of The Workshop on Electron Nucleus Scattering, Elba, Italy, Ju

Scientific paper

Nucleon resonances are investigated through the electromagnetic production of K-mesons. We study the kaon photoproduction process at tree-level and compare to a recently developed unitary K-matrix approach. Employing hadronic form factors along with the proper gauge prescription yields suppression of the Born terms and leads a resonance dominated process for both K-Lambda and K-Sigma photoproduction. Using new SAPHIR data we find the K+-Lambda photoproduction to be dominated by the S11(1650) at threshold, with additional contributions from the P11(1710) and P13(1720) states. The K-Sigma channel couples to a cluster of Delta resonances around W = 1900 MeV. We briefly discuss some tantalizing evidence for a missing D13 resonance around 1900 MeV with a strong branching ratio into KLambda channel.

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